88991564 has 6 divisors (see below), whose sum is σ = 155735244. Its totient is φ = 44495780.

The previous prime is 88991563. The next prime is 88991569. The reversal of 88991564 is 46519988.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (88991561) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11123942 + ... + 11123949.

It is an arithmetic number, because the mean of its divisors is an integer number (25955874).

Almost surely, 2^88991564 is an apocalyptic number.

It is an amenable number.

88991564 is a deficient number, since it is larger than the sum of its proper divisors (66743680).

88991564 is a wasteful number, since it uses less digits than its factorization.

88991564 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22247895 (or 22247893 counting only the distinct ones).

The product of its digits is 622080, while the sum is 50.

The square root of 88991564 is about 9433.5340143554. The cubic root of 88991564 is about 446.4604025249.

The spelling of 88991564 in words is "eighty-eight million, nine hundred ninety-one thousand, five hundred sixty-four".